Is There a Culture of Entrepreneurship in Silicon Valley?

There's a number of startups in LA, Snap Most, probably but others that are doing really well. In fact I bet there's more billion plus dollar companies in LA in the last few years than New York or at least more total market cap. And yet somehow everyone was talking about New York as the second Silicon Valley. There's blood scale in the Silicon Valley, there's blood scaling in China. Maybe LA is a more interesting case.